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Bagworms
Bagworm is a caterpillar that molts into a moth in the adult stage. They are easiest to identify by the bags they construct as they feed. Damage includes needle discoloration and injury.
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Bark Beetle
Bark beetles, family Scolytidae, are common pests of conifers (such as pines, Arborvitae, Fir, Juniper, Leyland Cypress) and some attack broadleaf trees. Over 600 species occurring the United States and Canada with approximately 200 in California alone. The most common species infesting pines in urban landscapes
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Elongate Hemlock Scale
The elongate hemlock scale sometime known as the fiorinia scale, is a serious scaled insect pest of hemlock.
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Spruce Spider Mite
The Spruce Spider Mite is considered one of the most destructive spider mites in the United States.